STUDY OF WORKABILITY AND PUMPABILITY OF SELF-CONSOLIDATING CONCRETE USED IN BRIDGE DECK-GIRDER CONNECTION

Author(s): Prof. Qi Cao and Prof. Kamal H. Khayat
Paper category: Proceeding
Book title: Design, Performance and Use of Self-Consolidating Concrete
Editor(s): Caijun Shi, Zhihua Ou and Kamal Henri Khayat
Print-ISBN: 978-2-35158-143-8
e-ISBN: 978-2-35158-144-5
Publisher: RILEM Publications SARL
Publication year: 2014
Pages: 141
Total Pages : 1
Language : English

Abstract: Self-consolidating concrete (SCC) is vital to the success of the precast deck system to fill the deck pockets and the large gap between the deck soffit and precast concrete girders without the need for expensive commercial grouts. An experimental program was undertaken to evaluate the performance of SCC designed for filling gap between precast bridge deck panels and girders and shear pockets as well. The study aimed to establish a testing protocol to prove the workalibity, pumpability and shrinkage reducing properties as well of proposed SCC mixture. It is also tailored to investigate the mixture full expansion potential under different curing conditions (water, dry and sealed cure) and robustness under different batching sequence, concrete temperature, superplasticizer dosage and water dosage. A combination of the slump flow and either L-box blocking ratio (h2/h1), J-ring, or V-funnel flow time can be used to assess filling capacity of SCC for quality control and design of SCC for placement in connection gap sections. The investigated mixture has good filling and passing ability with adequate retention of workability over 2 hours. The optimized SCC mixture also exhibits resistance to static bleeding and adequate compressive strength and expansion. Pumpability of the mixture is acceptable from laboratory mock-up test and pumping procedures are recommended for field application. It is recommended than SCC designed for bridge girder-deck connection application should have a slump flow of 650±50mm, and h2/h1 index greater than 0.80, a J-ring flow of 650±50mm, and a V-funnel flow time of less than 8 seconds. 250 microstrain can be specified to ensure proper shrinkage reduction and minimum cracking.

Online publication: 2017
Publication type: full_text
Public price (Euros): 0.00